Re: Factors Inhibiting Reproducability Of Simulation Results

From	Miles Bader <miles@gnu.org>
Newsgroups	comp.lang.c++
Subject	Re: Factors Inhibiting Reproducability Of Simulation Results
Date	2011-09-12 10:02 +0900
Message-ID	<87sjo2incy.fsf@catnip.gol.com> (permalink)
References	<9d1acbF38fU2@mid.individual.net> <slrnj6q77p.gtj.grahn+nntp@frailea.sa.invalid>

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Jorgen Grahn <grahn+nntp@snipabacken.se> writes:
>> 1)   My graphics library (GTKMM2) calling rand() at random times between 
>> the calls made by my code
>
> Aargh!  But in a sense that's just another example of the brokenness
> of rand(). You usually want a PRNG where you keep the state manually.
> I assume the TR1 random number stuff can do that.

The random state in both TR1 and C++11 is a part of the generator
object, so ... yeah.  [Of course it would be super duper surprising if
this wasn't true!]

-Miles

-- 
`There are more things in heaven and earth, Horatio,
 Than are dreamt of in your philosophy.'

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Factors Inhibiting Reproducability Of Simulation Results Chris Gordon-Smith <use.address@my.homepage> - 2011-09-10 14:26 +0000
  Re: Factors Inhibiting Reproducability Of Simulation Results "Paul" <pchristor@yahoo.co.uk> - 2011-09-10 17:04 +0100
  Re: Factors Inhibiting Reproducability Of Simulation Results Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-09-11 20:41 +0000
    Re: Factors Inhibiting Reproducability Of Simulation Results Miles Bader <miles@gnu.org> - 2011-09-12 10:02 +0900

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